package com.yjj.springboot3.service.impl;


import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yjj.springboot3.common.ErrorCode;
import com.yjj.springboot3.constant.CommonConstant;
import com.yjj.springboot3.constant.UserConstant;
import com.yjj.springboot3.exception.BusinessException;
import com.yjj.springboot3.exception.ThrowUtils;
import com.yjj.springboot3.model.dto.user.UserQueryRequest;
import com.yjj.springboot3.model.entity.User;
import com.yjj.springboot3.model.enums.UserRoleEnum;
import com.yjj.springboot3.model.vo.LoginUserVO;
import com.yjj.springboot3.model.vo.UserVO;
import com.yjj.springboot3.service.UserService;
import com.yjj.springboot3.mapper.UserMapper;
import com.yjj.springboot3.utils.SqlUtils;
import com.yjj.springboot3.utils.JwtUtils;
import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author 王洪顺
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-04-20 19:13:34
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{
    /**
     * 盐值，混淆密码
     */
    public static final String SALT = "yjj";

    @Resource
    private PasswordEncoder passwordEncoder;

    @Resource
    private JwtUtils jwtUtils;

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        // 密码和校验密码相同
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        synchronized (userAccount.intern()) {
            // 账户不能重复
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("userAccount", userAccount);
            long count = this.baseMapper.selectCount(queryWrapper);
            if (count > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
            }
            // 2. 加密
            String encryptPassword = passwordEncoder.encode(userPassword);
            // 3. 插入数据
            User user = new User();
            user.setUserAccount(userAccount);
            user.setUserPassword(encryptPassword);
            boolean saveResult = this.save(user);
            if (!saveResult) {
                throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
            }
            return user.getId();
        }
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        // 2. 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        User user = this.baseMapper.selectOne(queryWrapper);
        // 用户不存在或密码错误
        if (user == null || !passwordEncoder.matches(userPassword, user.getUserPassword())) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        // 3. 生成JWT token
        String token = jwtUtils.createToken(user);
        LoginUserVO loginUserVO = this.getLoginUserVO(user);
        loginUserVO.setToken(token);
        return loginUserVO;
    }


    /**
     * 获取当前登录用户
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 从JWT中获取用户信息
        User currentUser = jwtUtils.getLoginUser(request);
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 从数据库查询最新用户信息（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 获取当前登录用户（允许未登录）
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUserPermitNull(HttpServletRequest request) {
        // 从JWT中获取用户信息
        User currentUser = jwtUtils.getLoginUser(request);
        if (currentUser == null || currentUser.getId() == null) {
            return null;
        }
        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        return this.getById(userId);
    }

    /**
     * 是否为管理员
     *
     * @param request
     * @return
     */
    @Override
    public boolean isAdmin(HttpServletRequest request) {
        // 仅管理员可查询
        User user = jwtUtils.getLoginUser(request);
        return isAdmin(user);
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    /**
     * 用户注销
     *
     * @param request
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        User loginUser = jwtUtils.getLoginUser(request);
        if (loginUser == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        // 删除Redis中的用户信息
        jwtUtils.delLoginUser(loginUser.getToken());
        return true;
    }

    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVO(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String unionId = userQueryRequest.getUnionId();
        String mpOpenId = userQueryRequest.getMpOpenId();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(id != null, "id", id);
        queryWrapper.eq(StringUtils.isNotBlank(unionId), "unionId", unionId);
        queryWrapper.eq(StringUtils.isNotBlank(mpOpenId), "mpOpenId", mpOpenId);
        queryWrapper.eq(StringUtils.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StringUtils.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.like(StringUtils.isNotBlank(userName), "userName", userName);
        queryWrapper.orderBy(SqlUtils.validSortField(sortField), sortOrder.equals(CommonConstant.SORT_ORDER_ASC),
                sortField);
        return queryWrapper;
    }

    @Override
    public boolean banUser(Long userId, String banReason) {
        ThrowUtils.throwIf(userId == null || userId <= 0, ErrorCode.PARAMS_ERROR, "用户id无效");
        
        // 检查用户是否存在
        User user = this.getById(userId);
        ThrowUtils.throwIf(user == null, ErrorCode.NOT_FOUND_ERROR, "用户不存在");
        
        // 不能禁用管理员
        ThrowUtils.throwIf(UserConstant.ADMIN_ROLE.equals(user.getUserRole()), 
                ErrorCode.NO_AUTH_ERROR, "不能禁用管理员");
        
        // 更新用户角色为ban
        User updateUser = new User();
        updateUser.setId(userId);
        updateUser.setUserRole(UserConstant.BAN_ROLE);
        boolean result = this.updateById(updateUser);
        
        if (result) {
            log.info("用户 {} 已被禁用，原因：{}", userId, banReason);
        }
        
        return result;
    }

    @Override
    public boolean unbanUser(Long userId) {
        ThrowUtils.throwIf(userId == null || userId <= 0, ErrorCode.PARAMS_ERROR, "用户id无效");
        
        // 检查用户是否存在
        User user = this.getById(userId);
        ThrowUtils.throwIf(user == null, ErrorCode.NOT_FOUND_ERROR, "用户不存在");
        
        // 检查用户是否被禁用
        ThrowUtils.throwIf(!UserConstant.BAN_ROLE.equals(user.getUserRole()), 
                ErrorCode.PARAMS_ERROR, "该用户未被禁用");
        
        // 恢复为普通用户
        User updateUser = new User();
        updateUser.setId(userId);
        updateUser.setUserRole(UserConstant.DEFAULT_ROLE);
        boolean result = this.updateById(updateUser);
        
        if (result) {
            log.info("用户 {} 已解禁", userId);
        }
        
        return result;
    }

    @Override
    public boolean updatePassword(Long userId, String oldPassword, String newPassword) {
        ThrowUtils.throwIf(userId == null || userId <= 0, ErrorCode.PARAMS_ERROR, "用户id无效");
        ThrowUtils.throwIf(StringUtils.isAnyBlank(oldPassword, newPassword), 
                ErrorCode.PARAMS_ERROR, "密码不能为空");
        ThrowUtils.throwIf(newPassword.length() < 8, 
                ErrorCode.PARAMS_ERROR, "新密码长度不能少于8位");
        
        // 检查用户是否存在
        User user = this.getById(userId);
        ThrowUtils.throwIf(user == null, ErrorCode.NOT_FOUND_ERROR, "用户不存在");
        
        // 验证旧密码
        ThrowUtils.throwIf(!passwordEncoder.matches(oldPassword, user.getUserPassword()), 
                ErrorCode.PARAMS_ERROR, "原密码错误");
        
        // 检查新密码不能与旧密码相同
        ThrowUtils.throwIf(passwordEncoder.matches(newPassword, user.getUserPassword()), 
                ErrorCode.PARAMS_ERROR, "新密码不能与原密码相同");
        
        // 加密新密码并更新
        String encryptPassword = passwordEncoder.encode(newPassword);
        User updateUser = new User();
        updateUser.setId(userId);
        updateUser.setUserPassword(encryptPassword);
        boolean result = this.updateById(updateUser);
        
        if (result) {
            log.info("用户 {} 密码修改成功", userId);
        }
        
        return result;
    }

}




